65 to 70 Days to maturity. Raphanus sativus. Mantanghong Improved Chinese Radish Hybrid Seeds. Cool Season Annual. Mantanghong radishes are one of the most popular varieties in China. They are also known as Beauty Heart radishes. Beautifully round, vividly pink, and deliciously sweet. These radishes are a perfect way to add some interest to your garden this year! This fall season variety grows to 4 inches in diameter and looks like a ripe watermelon on the inside. They are large enough to carve into fun shapes if desired. ~ 3,800 seeds / oz.